#include<bits/stdc++.h>
using namespace std;
int main()
{
    char arr1[] = "abcd";
    char* pa = arr1;
    int n;
    cin >> n;
    char* arr2 = pa + n;
    strncpy(arr1, arr2, strlen(arr2));
    arr1[strlen(arr2)] = '\0';
    cout << arr1 << endl;
    return 0;
}
